This paper describes several new methods to predict and analyze rotorcraft noise. These methods are: 1) a combined computational fluid dynamics and Kirchhoff scheme for far-field noise predictions, 2) parallel computer implementation of the Kirchhoff integrations, 3) audio and visual rendering of the computed acoustic predictions over large far-field regions, and 4) acoustic tracebacks to the Kirchhoff surface to pinpoint the sources of the rotor noise. the paper describes each method and presents sample results for three test cases. The first case consists of in-plane high-speed impulsive noise and the other two cases show idealized parallel and oblique blade-vortex interactions. The computed results show good agreement with available experimental data but convey much more information about the far-field noise propagation. When taken together, these new analysis methods exploit the power of new computer technologies and offer the potential to significantly improve our prediction and unterstanding of rotorcraft noise.


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    Title :

    New computational methods for the prediction and analysis of helicopter noise


    Additional title:

    Neue Rechenverfahren für die Vorhersage und Analyse von Hubschrauberlärm


    Contributors:
    Strawn, R.C. (author) / Oliker, L. (author) / Biswas, R. (author)

    Published in:

    AIAA-Papers ; 96-1660/1793


    Publication date :

    1996


    Size :

    11 Seiten, 13 Bilder, 25 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    New Computational Methods for the Prediction and Analysis of Helicopter Noise

    Roger C. Strawn / Leonid Oliker / Rupak Biswas | AIAA | 1997


    New computational methods for the prediction and analysis of helicopter noise

    Strawn, Roger / Oliker, Leonid / Biswas, Rupak | AIAA | 1996



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